ToolNestFree Camping Stove Fuel Calculator
Last updated: November 4, 2026
Quick answer: Running out of stove fuel miles from the trailhead is a trip-ender, and carrying a spare canister 'just in case' is dead weight on every step — yet the guides all answer a different half of the question, one with a rule of thumb, another with a canister-size table, never your trip's number. This free camping stove fuel calculator combines everything in one run: your group size, days, hot meals and hot drinks per person per day, your stove type, and the conditions, plus a safety margin, and returns the fuel in grams and the canisters to carry. On the defaults (2 people, 3 days, 2 hot meals and 2 hot drinks each per day, standard stove, fair conditions, 20% margin), you need 184 grams — one 230 g canister. Everything runs in your browser; no signup. Canister sizes here are net fuel weights (100, 230, 450 g), and the tool is for canister gas stoves — liquid-fuel and alcohol stoves burn different fuels and are not covered.
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Worked example: 2 people x 3 days x (2 meals x 0.5 L + 2 drinks x 0.3 L = 1.6 L per person per day) = 9.6 litres of water. At 16 g per litre for a standard stove in fair conditions that is 153.6 g, and with a 20% safety margin 184.3 g, shown as 184 g — one 230 g canister, with 46 g to spare.
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How to Use the Camping Stove Fuel Calculator
- Enter your group size and days — the trip length in days, counting every night you will cook, not just the hiking days. A 3-day trip with cooking on the arrival evening and the departure morning is 3 cooking days, and the most common fuel mistake is counting nights instead of cooking days and coming up one breakfast short.
- Enter hot meals and hot drinks per person per day. A hot meal is counted as 0.5 litres of water boiled (a freeze-dried meal plus a shared pot of water) and a hot drink as 0.3 litres; the defaults (2 meals, 2 drinks) give 1.6 litres per person per day. If your group boils extra water for washing up or a second coffee, add it as an extra drink — the tool cannot know about water it is not told about.
- Pick your stove type. A standard canister-top stove burns about 16 g of fuel per litre boiled (8 g per 500 ml); a heat-exchanger pot stove, with its fins capturing heat that would otherwise escape, burns about 11 g per litre (roughly 5.5 g per 500 ml). That one choice cuts fuel by about a third, which is why a heat-exchanger pot is the single best fuel-saving upgrade for a group.
- Pick the conditions and the safety margin (20% by default). Wind is the biggest fuel thief — an unshielded stove in wind can burn half as much again — cold adds its own penalty, and melting snow is in a different league entirely (about three times the fuel, because the snow must first be melted and then boiled). The margin covers the boil you forgot, the wind gust you did not plan for, and the canister that runs out a little early in the cold.
- Press Calculate fuel and read the fuel in grams, the canisters to carry, and the spare fuel in those canisters. If the spare is large (for example, a 230 g canister for a 110 g trip), consider whether a 100 g canister plus a careful margin is the lighter honest choice — but never plan to finish a trip on exactly zero fuel.
Why Use Our Camping Stove Fuel Calculator?
- People, days, meals, and drinks in one calculation — the ranking guides give a rule of thumb for a solo hiker or a table for one group size, and the ranking calculators take fewer inputs. This page takes your actual group, your actual days, and your actual hot meals and drinks, so a family of four for five days and a solo hiker for a weekend get different answers, as they should.
- Stove type changes the answer — a heat-exchanger pot burns about 11 g per litre against a standard stove's 16 g, a roughly one-third saving that the guide tables ignore. Two calculators that ignore the pot type will agree with each other and both be wrong for your stove; this page asks which stove you own.
- Conditions as multipliers, stated openly — windy x1.5, cold x1.75, melting snow x3.0, applied to the fuel, not hidden in a footnote. A trip planned on fair-weather numbers and cooked in a gale is a trip that runs out of fuel; the multiplier is the difference between a plan and a guess.
- A canister answer, not just a gram answer — fuel is bought in 100, 230, and 450 g canisters, and '184 g' is not a shopping list. The page converts the grams into the canister combination to carry and states the spare fuel, so you know both what to buy and how much slack you have.
- Honest about what it does not cover — this is a canister-gas calculator. Liquid-fuel (white gas) and alcohol stoves have different energy densities and are measured differently, and a canister's usable fuel drops in extreme cold as pressure falls. Those limits are stated on the page, not buried, because a fuel number used as a guarantee is worse than no number.
Common Use Cases
- A solo weekend, 1 person, 2 days (the lightest honest plan): 1 person x 2 days x 1.6 litres per person per day = 3.2 litres. Standard stove at 16 g per litre = 51.2 g, plus 20% margin = 61 g — one 100 g canister, with 39 g to spare. The spare is the whole point: a 100 g canister is the right call here, and the 39 g covers one windy breakfast without a second canister.
- A group of four for five days with a heat-exchanger pot: 4 people x 5 days x (3 meals x 0.5 L + 2 drinks x 0.3 L = 2.1 L per person per day) = 42.0 litres. Heat-exchanger at 11 g per litre = 462 g, windy conditions (x1.5) = 693 g, plus 20% margin = 832 g — two 450 g canisters (900 g capacity, 68 g spare). On a standard stove in the same wind, the same trip would need about 1,209 g, or three 450 g canisters: the pot choice saves a whole canister.
- Melting snow for water, 2 people, 3 days: 2 people x 3 days x 1.6 litres = 9.6 litres. Standard stove at 16 g per litre = 153.6 g, melting snow (x3.0) = 460.8 g, plus 20% margin = 553 g — one 450 g canister plus one 230 g canister (680 g capacity, 127 g spare). Snow trips are where fuel planning fails most often, because the water itself has to be manufactured: a fair-weather plan for this trip would carry 184 g and run out on day one.
Camping Stove Fuel Calculator vs Alternatives
- Retailer and brand guides (REI, MSR — the sites ranking today): REI's and MSR's guides are written by people who sell stoves, and their rules of thumb are sound — about 8 g per 500 ml, the 100/230/450 g canister table, the wind and snow warnings. But a guide is not a calculator: it gives you the rule and leaves the arithmetic for your group, your days, and your meals to you, by hand, every time. Use a guide to learn the method; use this page to get your trip's number.
- Dedicated fuel calculators (Walkabout Outfitter, MercatorGear — the two ranking today): Both ranking calculators compute fuel from trip inputs, and both are worth a check — but each takes fewer inputs than this page (no combined meals-plus-drinks water model, no separate heat-exchanger rate, or no canister-combination answer), so the number they return is a starting point, not a shopping list. If their answer and this page's answer differ, the difference is almost always one of those missing inputs: check which one your trip actually has.
- Forum fuel answers (Reddit, Backpacking Light — the threads ranking today): Forums answer fast and from experience — 'I used one 230 g canister for four days for two people' — which is helpful exactly once, for a trip of that size, that stove, and that weather, and misleading for any other trip, because the answers rarely state all three. Use a forum to find which stove and pot to buy, then compute your own trip here before you pack.
If you want to learn how fuel planning works, the REI and MSR guides are the place to start. If you want your trip's grams and its canisters from your group, days, meals, drinks, stove, and conditions together, that is the job this page does.
Frequently Asked Questions
How much camping stove fuel do I need?
Multiply water by fuel per litre, then by conditions and margin. As a worked example, 2 people for 3 days at 2 hot meals (0.5 L each) and 2 hot drinks (0.3 L each) per person per day boil 2 x 3 x 1.6 = 9.6 litres. A standard stove at 16 g per litre uses 153.6 g, and with a 20% safety margin that is 184 g — one 230 g canister. Enter your own group, days, meals, drinks, stove, and conditions above for your trip.
How many boils do I get from a 100 g canister?
About 12 boils of 500 ml on a standard stove (100 / 8 = 12.5, before wind, cold, and margin) and about 18 on a heat-exchanger stove (100 / 5.5 = 18.2). In trip terms, a solo hiker boiling 1.6 litres a day (2 meals + 2 drinks) uses about 26 g a day on a standard stove before margin, so a 100 g canister lasts roughly 3 days in fair weather — and about 2 days once wind and a safety margin are counted. That is why the calculator, not the canister label, should plan the trip.
How much extra fuel do wind and cold use?
Wind is the biggest factor: an unshielded stove in wind commonly uses about 1.5 times the fair-weather fuel, which is why a windscreen (kept clear of the canister for safety) matters more than a lighter stove. Cold below freezing adds roughly a further penalty, counted here as x1.75 in total, and melting snow for water is about x3.0, because the snow must be melted before it can be boiled. If your trip has both wind and cold, pick the worse condition rather than adding multipliers together — the calculator's single-condition choice is deliberately conservative, not a licence to stack penalties.
Does a heat-exchanger pot really save that much fuel?
Yes — roughly a third. A standard canister-top stove burns about 16 g per litre (8 g per 500 ml boil); a heat-exchanger pot, whose fins capture heat that would otherwise escape around the pot, burns about 11 g per litre (about 5.5 g per 500 ml). On the default trip (9.6 litres), that is 106 g against 154 g before margin — enough to drop a canister size on a longer trip, and the saving grows with group size, because every litre saved is saved for every person.
How do I check how much fuel is left in a partly used canister?
Weigh it. The float test (dunking the canister in water) is unreliable because it depends on the canister's shape and gives no number. Weigh the canister on a kitchen scale and subtract its empty (tare) weight — printed on many canisters or measured once when you finish one — and the difference is the fuel left. If the scale says the canister holds less than your trip needs plus margin, it is a spare, not a main canister: carry it as well as a full one, or not at all.
Does this calculator work for liquid-fuel or alcohol stoves?
No — it is for canister gas stoves only (the screw-on isobutane/propane canisters). Liquid-fuel stoves (white gas) and alcohol stoves burn fuels with different energy densities, are measured in millilitres rather than grams of gas, and behave differently in cold, so their numbers would not come out of this formula. If you cook on white gas, plan in millilitres from your stove maker's consumption figures and carry the same 20% margin — the planning habit transfers, the arithmetic does not.